interface Com {
int add(int a,int b);
}
abstract class A {
abstract int add(int a,int b);
}
class B extends A implements Com{
public int add(int a,int b) {
return a+b;
}
}
public class E62 {
public static void main(String args[]) {
B b = new B();
Com com = b;
System.out.println(com.add(12,6));
A a = b;
System.out.println(a.add(10,5));
}
}
